Cooling system of dry-type transformer

Abstract

The invention provides a cooling system of a dry-type transformer, and relates to the technical field of electrical equipment.The cooling system of the dry-type transformer comprises a fixing frame, an iron core and a winding and further comprises a cooling device installed on one side of the fixing frame and capable of cooling the winding; the wind shield is located in the fixing frame and slidably connected with the fixing frame, the wind shield is provided with a penetrating opening allowing the winding to penetrate through, a gap is formed between the penetrating opening and the outer side of the winding, air passing through the gap can be accelerated, and therefore the winding can be locally cooled; the lifting assembly is connected with the wind shield and can drive the wind shield to move so as to change the cooling position of the winding; the number of the windings is multiple, every two windings which are coaxially arranged form a group, and a wind blocking cylinder is arranged between every two windings in the same group. Cooling is achieved through the gap formed between the penetrating opening in the wind shield and the winding, meanwhile, precise cooling is completed in cooperation with the lifting assembly, the capacity of precise regional cooling in the working process of the transformer is improved, and the stability of the transformer is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a cooling system for a dry-type transformer. Background Art

[0002] As the core equipment in the power system, the operating stability of the transformer directly affects the safety and efficiency of the entire power grid. Transformers include dry-type transformers. Dry-type transformers have the advantages of large short-circuit resistance, low protection, high operating efficiency, small size, and low noise. They are widely used in substations, high-rise buildings, airports and other places with high safety and environmental protection requirements.

[0003] With the widespread application of dry-type transformers, dry-type transformers are developing towards large capacity and intelligent features. Currently, the mainstream single-unit 24-pulse rectifier products are basically oil-immersed transformers. There are only a few single-unit 24-pulse dry-type rectifier transformers, but these are mostly 10kV products. There are basically no 35kV single-unit 24-pulse rectifier dry-type transformers. A single 24-pulse rectifier product integrates four conventional 6-pulse transformers into a single transformer, reducing overall costs and installation space. The four-split phase-shifting design on the low-voltage side enables the transformer to achieve low harmonic generation, high overload capacity, a small footprint, and high integration.

[0004] However, due to the product's large capacity, the overall size is relatively large. Furthermore, due to the high voltage level, the insulation distance is greatly increased, further increasing the size. The impact of the axially split structure of a single 24-pulse rectifier dry-type transformer on the height has caused the product to reach the maximum size limit for transformer products. Combined with the dry-type transformer casing, the height has reached the transportable limit of 5 meters. In addition, the temperature rise design of each axial coil of the axially split transformer itself is a major challenge. The high harmonic rectification load further exacerbates the difficulty of controlling the hot spot temperature of the coil winding. The temperature rise control cooling system cannot effectively ensure the uniformity of the transformer's heat dissipation, and cannot accurately cool the coil winding when it reaches a local high temperature.

[0005] Therefore, in order to solve the above problems, the present invention proposes a cooling system for a dry-type transformer, aiming to improve the comprehensiveness and accuracy of the cooling system's temperature reduction. Summary of the Invention

[0006] The object of the present invention is to provide a cooling system for a dry-type transformer, aiming to solve the problem that the cooling system does not cool down uniformly and accurately.

[0007] To achieve the above object, the present invention adopts the following technical solution: a cooling system for a dry-type transformer, comprising a fixing frame, an iron core disposed within the fixing frame, a winding disposed on the outer side of the iron core, and further comprising: A cooling device, installed on one side of the fixing frame, capable of cooling the winding; A windshield is located inside the fixed frame and is slidably connected thereto. The windshield is provided with a through-hole for the winding to pass through. A gap is provided between the through-hole and the outside of the winding to accelerate the air passing therethrough, thereby locally cooling the winding. The lifting assembly is connected to the windshield and can drive the windshield to move and change the cooling position of the winding; There are multiple windings, two coaxially arranged windings form a group, and a windshield is provided between the two windings in the same group.

[0008] Preferably, two windshield plates are provided in the longitudinal direction, respectively located at the upper and lower sides of the windshield cylinder, and both windshield plates are connected to a lifting assembly.

[0009] Preferably, the windshield is further provided with a vent, and a plurality of vents are provided to achieve uniform distribution of the cooling gas.

[0010] Preferably, the windshield is further provided with a plurality of sliding members, and the sliding members are slidably connected to the fixing frame.

[0011] Preferably, the cooling device is located outside one side of the fixing frame and is connected to the fixing frame.

[0012] Preferably, an air inlet end and an air outlet end are provided on a side of the cooling device close to the winding, the level of the air inlet end is higher than the wind shield, and the level of the air outlet end is lower than the wind shield.

[0013] Preferably, a plurality of clamping seats are connected to the fixing frame, and the clamping seats can clamp and fix the iron core.

[0014] Preferably, a plurality of fans are provided on the outer side of the clamp seat located at the lower side of the winding, and the air outlets of the fans face the winding.

[0015] Preferably, the windshield is sleeved on the outside of the winding, and the windshield includes a fixed part and a movable part. A connecting part is provided between the fixed part and the fixed frame; and the fixed part is slidably connected to the movable part.

[0016] Preferably, the fixing member is provided with a moving assembly capable of driving the moving member to move.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention achieves cooling through the gap formed between the through-hole on the windshield and the winding, and cooperates with the lifting component to achieve precise cooling. When the temperature sensor detects an abnormal temperature area, the lifting component moves the windshield to a specified position, and the gap formed by the windshield and the winding allows cold air to move quickly to complete the cooling of the area; thus, precise cooling of the transformer winding is achieved, achieving the purpose of precise regional cooling during transformer operation and ensuring the stability of the transformer.

[0018] 2. The present invention enables the air flow in the transformer housing to cover the entire transformer through the precise arrangement of different vents on the windshield, thereby improving the uniformity of the transformer's heat dissipation.

[0019] 3. The present invention improves the ability to cool the inside of the winding by setting up moving parts and moving components in the windshield; when the temperature inside the winding rises abnormally, the cooperation between the moving parts and the moving components enhances the ability to cool the inside of the winding, and improves the ability to fully cool the winding after the temperature inside the winding rises abnormally. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 Schematic diagram of internal gas flow of the present invention.

[0022] Figure 3 This invention Figure 2 A partial enlarged view of point A in the middle.

[0023] Figure 4 It is a schematic diagram of the position of the windshield in the present invention.

[0024] Figure 5 This invention Figure 4 A partial enlarged view of point B in the middle.

[0025] Figure 6 This invention Figure 4 A partial enlarged view of point C in the middle.

[0026] Figure 7 It is a structural schematic diagram of the windshield in the present invention.

[0027] Figure 8 It is a schematic diagram of the position of the windshield in the present invention.

[0028] Figure 9 This invention Figure 8 A partial enlarged view of point D in the middle.

[0029] Reference numerals: 1. Winding; 2. Iron core; 3. Fixed frame; 4. Cooling device; 5. Wind shield; 6. Lifting assembly; 7. Wind shield; 8. Moving assembly; 9. Clamp; 10. Fan; 11. Casing; 101. High-voltage coil; 102. Low-voltage coil; 103. Insulating tube; 104. Upper pad; 105. Middle pad; 106. Lower pad; 107. Positioning ring; 108. Wind shield ring; 401. Air inlet; 402. Air outlet; 501. Sliding part; 502. Vent; 503. Through-hole; 601. First gear; 602. First driving part; 603. First rack; 701. Fixed part; 702. Moving part; 703. Connecting part; 704. Guide surface; 801. Second gear; 802. Second driving part; 803. Second rack. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Herein, “winding 1 ” refers to a complete coil unit, including subcomponents such as a high-voltage coil 101 , a low-voltage coil 102 , and an insulating cylinder 103 .

[0032] Example 1 In order to improve the cooling effect of dry-type transformers, Figures 1 to 9 As shown, the present invention proposes a cooling system for a dry-type transformer, including a fixing frame 3, a shell 11 is provided on the outside of the fixing frame 3, and a plurality of support rods are fixedly connected to the inside of the fixing frame 3 for supporting internal components.

[0033] An iron core 2 is provided in the fixing frame 3, and a winding 1 is provided on the outside of the iron core 2. The iron core 2 includes multiple longitudinal iron core columns and two transverse iron yokes. The winding 1 is provided on the iron core columns. Multiple clamping seats 9 are connected in the fixing frame 3. The clamping seats 9 are all located at the iron yoke of the iron core 2. The clamping seats 9 can clamp and fix the iron core 2.

[0034] It should be noted that a gap is provided in the middle of the iron core 2 to form an axial airway, which can quickly take away the heat generated in the iron core 2 during the heat dissipation process. The clamp 9 includes a clamp and a shock-absorbing seat. The clamp is clamped at the iron yoke of the iron core 2. The shock-absorbing seat is located between the iron core 2 and the clamp 9. The clamp can fix the iron core 2 through a long screw. The shock-absorbing seat is used to reduce the axial vibration of the iron core 2 to ensure the normal operation of the iron core 2.

[0035] In this embodiment, the cooling system of the dry-type transformer further includes: The cooling device 4 is installed on one side of the fixing frame 3 and can cool the winding 1. The cooling device 4 is located outside one side of the fixing frame 3 and is connected to the fixing frame 3. The cooling device 4 and the housing 11 form a sealed environment. The gas in the housing 11 circulates with the gas in the cooling device 4 to dissipate heat from the transformer.

[0036] An air inlet 401 and an air outlet 402 are provided on the side of the cooling device 4 facing the winding 1 . The air inlet 401 is higher than the wind shield 5 , and the air outlet 402 is lower than the wind shield 5 .

[0037] It should be noted that the air inlet end 401 of the cooling device 4 is located above the air outlet end 402. The air inlet end 401 is located in the upper half of the cooling device 4 close to the fixed frame 3, and the air outlet end 402 is located in the lower half. The air inlet end 401 of the cooling device 4 is provided with a fan, and multiple fans are provided in the horizontal direction. The air inlet end 401 can extract the hot air inside the outer shell 11, and the air outlet end 402 of the cooling device 4 injects cooled cold air into the outer shell 11. The cooling device 4 also includes a part for cooling the air. The cooler of this part may include a water-cooled core, which cools the hot air and injects it into the bottom of the outer shell 11.

[0038] The cooling device 4 draws hot air into the interior of the cooling device 4 from the air inlet end 401, passes through the water-cooled core, and converts the hot air into cold air, which is injected into the bottom of the transformer casing 11 from the lower air outlet end 402. The cold air then enters the interior of the transformer and moves upward to take away the heat, ensuring the safe operation of the transformer.

[0039] In this embodiment, the wind shield 5 is located in the fixing frame 3, and the wind shield 5 is placed horizontally between the air inlet end 401 and the air outlet end 402. The wind shield 5 is provided with a through opening 503 for the winding 1 to pass through. There is a gap between the through opening 503 and the outside of the winding 1, which can accelerate the air passing through it, thereby locally cooling the winding 1.

[0040] It should be noted that the winding 1 passes through the through-hole 503 of the windshield 5, and a gap is formed between the winding 1 and the windshield 5. The cold air below the windshield 5 enters above the windshield 5 through the gap. According to the law of fluid dynamics, it can be seen that the movement speed of the gas will increase when passing through the gap. In the same time, the winding 1 is exposed to more cold air. Therefore, the winding 1 on the upper side of the windshield 5 will have a better cooling effect, and when the cold air passes through quickly, while cooling the winding 1, the temperature of the cold air will not increase excessively due to long-term contact with the winding 1, and will not affect the cooling effect of the winding 1 above.

[0041] The windshield 5 divides the internal space of the transformer casing 11 into two spaces, the upper part is the hot air area, and the lower part is the cold air area. The windshield 5 separates them, and the cold air in the lower part must pass through the through-hole 503 to circulate upward, thereby ensuring the cooling air volume inside the transformer; the gas quickly passes through the gap to cool the winding 1, without excessively affecting the temperature of the cold air and the normal cooling of other parts.

[0042] In this embodiment, there are multiple windings 1, and two coaxially arranged windings 1 form a group. A windshield 7 is provided between the two windings 1 in the same group, and the windshield 7 is coaxially sleeved on the outside of the winding 1.

[0043] It should be noted that the two windings 1 are coaxially arranged in the vertical direction, and the two coaxially arranged windings 1 form a group. The vertical arrangement design can better dissipate heat, and at the same time can also reduce the footprint of the transformer, can be used in a smaller space, and increase the scope of application of the equipment.

[0044] In this embodiment, the winding 1 includes a low-voltage coil 102, which is sleeved around the outer side of the iron core 2. An insulating sleeve 103 is sleeved around the outer side of the low-voltage coil 102, and a high-voltage coil 101 is sleeved around the outer side of the insulating sleeve 103. A gap is provided between the low-voltage coil 102, the insulating sleeve 103, and the high-voltage coil 101. Positioning rings 107 are provided at both ends of each low-voltage coil 102 to separate and secure each low-voltage coil 102.

[0045] It should be noted that each winding 1 includes a group of high-voltage coils 101, a group of insulating tubes 103 and two groups of low-voltage coils 102. The two groups of low-voltage coils 102 are vertically coaxially arranged and are both in the same group of insulating tubes 103. Two windings 1 are coaxially arranged on each core column of the iron core 2, forming four independent coils that are axially split; the high-voltage coil 101, the insulating tube 103 and the low-voltage coil 102 are coaxially arranged, and there are gaps between them, so that the heat generated during the operation of the transformer can be discharged more quickly, thereby improving the stability of the transformer operation.

[0046] A windshield ring 108 is provided at the lower end of the insulating cylinder 103. The high-voltage coil, low-voltage coil, and iron core 2 are heat generators and are the primary heat sinks. The space between the insulating cylinders 103 is large, and the passage of cold air would result in airflow loss. Therefore, windshield ring 108 is added at the lower end of the insulating cylinder 103 to restrict cold air flow to the inner and outer coil sides of the insulating cylinder 103.

[0047] The gaps between the high-voltage coil 101, the insulating tube 103 and the low-voltage coil 102 form multiple air channels. An axial air channel is formed between the high-voltage coils 101, and an axial air channel is formed between the high-voltage coils 101 and the high-voltage coils 101. The gaps between the insulating tubes 103 are blocked by the wind shield ring 108 at their ends, and gas will not pass through them. An axial air channel is formed between the high-voltage coil 101 and the low-voltage coil 102, and three axial air channels are formed inside the low-voltage coil 102. Multiple axial air channels improve the heat dissipation capacity of the coil.

[0048] Since the coils of the transformer of the present invention are very high and the axial phase is split into four independent coils, the coils cannot conduct heat quickly. When the air heated by the bottom coil moves upward, the temperature rise of the upper coil will be higher than the temperature rise of the lower coil. By adding a windshield 7 in the middle of the winding 1, the distance between the windshield 7 and the coil winding 1 can be adjusted to control the amount of cold air entering the middle, thereby balancing the temperature rise of the upper and lower coils.

[0049] If the windshield 7 is not added in the middle part, since the power mainly comes from the exhaust of the upper air inlet end 401 of the cooling device 4, most of the cold air will directly enter the upper coil from the middle part, resulting in only a small amount of cold air entering the lower part, causing the temperature rise of the lower coil to be higher than that of the upper coil.

[0050] In this embodiment, multiple middle pads 105 are provided between two windings 1 in the same group. Upper pads 104 are provided on the upper side of each winding 1, and lower pads 106 are provided on the lower side. The upper pads 104, lower pads 106, and middle pads 105 are used to clamp the high-voltage coil 101 and the low-voltage coil 102 together, positioning and securing them. Multiple upper pads 105, lower pads 106, and middle pads 104 are evenly arranged in a circular pattern.

[0051] In this embodiment, a plurality of fans 10 are provided outside the clamping seat 9 located at the lower side of the winding 1 , and the air outlets of the fans 10 face the winding 1 .

[0052] It should be noted that the fan 10 can be equipped with eight high-pressure axial flow fans to blow air toward the top. To compensate for the greatly increased air resistance within the transformer due to the transformer's extra height, the cooling device 4 is used in conjunction to ensure the air volume passing through the coil. During use, the fan 10 blows cold air from the bottom into the space between the high-voltage coil 101, the low-voltage coil 102, and the iron core 2, blowing the hot air inside upward to dissipate heat from the inside of the winding 1, while also distributing the cold air from the bottom more evenly below the windshield 5.

[0053] This system is particularly suitable for a 35kV single 24-pulse rectifier dry-type transformer. It reduces local hot spots under harmonic loads through precise wind control using the windshield 5 and windshield 7.

[0054] When the above device is working, the cooling device 4 is started, and the air inlet end 401 draws the hot air above the wind shield 5 into the interior of the cooling device 4. After being cooled by the water-cooled core at the bottom of the cooling device 4, it is discharged into the bottom of the outer shell 11 through the air outlet end 402. The fan 10 blows the cold air upward to assist in cooling and air circulation. The gas entering the winding 1 cools the inside thereof, and the air outside the winding 1 cools the outside thereof. When the air passes through the wind shield 5, it passes through the gap between the through-hole 503 of the wind shield 5 and the winding 1, and the cold air is accelerated, thereby better cooling the winding 1 above the wind shield 5.

[0055] In this embodiment, the wind shield 5 is provided to form a gap for accelerating air, and the accelerated cold air strengthens the cooling of the frequently heating parts of the winding 1. In addition, the wind shield 7 is provided to ensure the cooling effect of the lower winding 1. The above settings enhance the cooling effect of the transformer and improve the stability of the transformer operation.

[0056] Example 2 In actual use, it was found that the cooling effect in the direction away from the cooling device 4 was not as good as that in the direction close to the cooling device 4, that is, the cooling system could not effectively ensure the uniformity of heat dissipation of the transformer, and the problem of being unable to accurately cool down when high temperature was generated locally in the coil winding 1 occurred.

[0057] To solve the above technical problems, in another embodiment of the present invention, the windshield 5 is slidably connected to the fixing frame 3, and the cooling system of the dry-type transformer further includes a lifting assembly 6, which is connected to the windshield 5 and can drive the windshield 5 to move and change the cooling position of the winding 1.

[0058] It should be noted that multiple temperature sensors are installed at different positions inside the transformer. When an abnormal temperature in a region is detected, the lifting assembly 6 drives the wind shield 5 to move longitudinally, so that the wind shield 5 is located near the abnormal area, allowing the cold air accelerated when passing through the wind shield 5 to accurately cool the abnormal area.

[0059] In this embodiment, two windshield plates 5 are provided in the longitudinal direction, respectively located at the upper and lower sides of the windshield cylinder 7 , and both windshield plates 5 are connected to the lifting assembly 6 .

[0060] It should be noted that the two windshields 5 correspond to the two longitudinal windings 1. When the two longitudinal windings 1 both have abnormal temperature areas, the two windshields 5 can cool down their respective windings 1 at the same time, thereby improving the comprehensiveness of transformer cooling.

[0061] In this embodiment, the windshield 5 is further provided with a plurality of sliding members 501, which are located at the edge of the windshield 5 and are slidably connected to the fixing frame 3. The sliding members 501 ensure the stability of the windshield 5 during movement.

[0062] The air baffle 5 is further provided with air vents 502, and the air vents 502 are provided in plurality and are different in size, so that the uniform distribution of cooling gas can be realized.

[0063] It should be noted that the air baffle 5 is provided with different air vents 502, and in general, the air vent 502 far from the cooling device 4 is larger than the air vent 502 close to the cooling device 4, so that the flow capacity of the gas far from the cooling device 4 is increased, thereby balancing the overall cooling state in the shell 11 and ensuring the uniformity of the overall cooling.

[0064] The lifting assembly 6 can move the air baffle 5 in the moving mode of the gear and the rack, as shown in Figure 5 The air baffle 5 is provided with a first driving member 602, a first gear 601 is coaxially arranged on the output shaft of the first driving member 602, a first rack 603 is arranged on one side of the first gear 601 and engaged with the first gear 601, and the first rack 603 is connected to the fixed frame 3. After the first driving member 602 is started, the first gear 601 is driven to rotate, and the air baffle 5 is moved up and down through the engagement with the first rack 603.

[0065] The lifting assembly 6 can also move the air baffle 5 in the mode of the screw rod driving, a rotating connecting screw rod is arranged on the fixed frame 3, a driving motor is arranged at one end of the screw rod, the screw rod passes through the sliding member 501 and is engaged with the sliding member 501, the driving motor is started, the screw rod rotates, the sliding member 501 moves longitudinally, and the air baffle 5 is moved.

[0066] When the temperature sensor detects temperature abnormality, the lifting assembly 6 moves the air baffle 5 to the abnormal area, the cooling device 4 normally works, the flow speed of the cold air is increased after passing through the gap, and more cold air passes through the abnormal area at the same time, so that the temperature abnormal area can be precisely cooled.

[0067] In the embodiment, through the arrangement of the lifting assembly 6 and the air vent 502, the through hole 503 of the air baffle 5 is matched, the full-range precise cooling of the winding 1 is realized, and the uniformity of the heat dissipation of the transformer is ensured.

[0068] Embodiment three In actual use, the air temperature of the lower side of the winding 1 is increased after entering the upper side, so that the air temperature of the upper winding 1 is higher than that of the lower winding 1, and the air that has been heated cannot be sufficiently cooled when the temperature of the upper winding 1 is too high.

[0069] To solve the above technical problem, in another embodiment of the present application, the air baffle 7 comprises a fixed member 701 and a moving member 702, a connecting member 703 is arranged between the fixed member 701 and the fixed frame 3, and the fixed member 701 and the moving member 702 are slidingly connected.

[0070] It should be noted that the upper end of the windshield 7 is provided with an inwardly converging guide surface, the fixing member 701 of the windshield 7 is connected to the fixing frame 3 through the connecting member 703, and the movable member 702 slides longitudinally on the fixing member 701. When the transformer is working normally, the movable member 702 is in the initial position and does not contact the two windshields 5. There is a gap between the windshield 7 and the winding 1. Only part of the cold air ejected from the gap between the through-hole 503 of the windshield 5 below and the winding 1 will enter the windshield 7, and the rest of the gas will pass through the upper The windshield 5 cools the outside of the winding 1; when the temperature inside the winding 1 rises abnormally, the moving part 702 moves and contacts the windshield 5 below. At this time, the gap between the upper end of the windshield 7 and the winding 1 is enlarged, revealing the gap between the two windings 1, rather than completely separating. Most of the cold air passing through the through-hole 503 is located in the windshield 7, and the cold air is guided to the gap between the two windings 1 through the guide surface, so that the cold air outside the winding 1 enters the interior of the winding 1, thereby improving the cooling effect inside the winding 1.

[0071] In this embodiment, a moving assembly 8 is provided on the fixed member 701 to drive the moving member 702 to move. It should be noted that, through real-time monitoring by the temperature sensor, the moving assembly 8 dynamically adjusts the state of the windshield 7 to control abnormal coil temperature in real time.

[0072] In this embodiment, if Figure 6 As shown, the moving assembly 8 includes a second driving member 802, which is connected to the fixed member 701 and is located outside the windshield 7. The output shaft of the second driving member 802 is provided with a coaxial second gear 801. A second rack 803 is engaged on one side of the second gear 801, and the second rack 803 is connected to the moving member 702. When the second driving member 802 is activated, it drives the second gear 801 to rotate, and the engagement between the gear and the rack causes the moving member 702 to move longitudinally.

[0073] When the temperature inside the winding 1 rises abnormally, the second driving member 802 starts, and drives the movable member 702 to move longitudinally through the second gear 801 and the second rack 803, so that the lower end of the movable member 702 contacts the windshield 5 below. The two cooperate to retain most of the cold air passing through the through-hole 503 in the windshield 7, and send the cold air into the winding 1 through the guide surface on the windshield 7, thereby enhancing the cooling degree of the inner side of the winding 1.

[0074] The present invention improves the ability to cool the inside of the winding 1 by arranging the moving part 702 and the moving assembly 8 in the windshield 7. When the temperature inside the winding 1 rises abnormally, the cooperation between the moving part 702 and the moving assembly 8 enhances the ability to cool the inside of the winding 1, thereby solving the problem that the temperature inside the winding 1 cannot be fully cooled after the temperature rises abnormally.

[0075] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A cooling system for a dry-type transformer, comprising a fixing frame (3), an iron core (2) being arranged inside the fixing frame (3), and a winding (1) being sheathed on the outer side of the iron core (2), characterized in that: Also includes: A cooling device (4) is installed on one side of the fixing frame (3) and is capable of cooling the winding (1); A windshield (5) is located inside the fixing frame (3) and is slidably connected thereto. The windshield (5) is provided with a through-hole (503) for the winding (1) to pass through. A gap is provided between the through-hole (503) and the outside of the winding (1), which can accelerate the passing air, thereby locally cooling the winding (1); A lifting assembly (6) is connected to the windshield (5) and is capable of driving the windshield (5) to move, thereby changing the cooling position of the winding (1); There are multiple windings (1), two coaxially arranged windings (1) form a group, and a windshield (7) is provided between the two windings (1) in the same group.

2. The cooling system according to claim 1, characterized in that Two windshield plates (5) are provided in the longitudinal direction, respectively located on the upper and lower sides of the windshield cylinder (7), and both windshield plates (5) are connected to a lifting assembly (6).

3. The cooling system according to claim 2, characterized in that The windshield (5) is also provided with a vent (502), and a plurality of vents (502) are provided, thereby enabling uniform distribution of the cooling gas.

4. The cooling system according to claim 3, characterized in that The windshield (5) is further provided with a plurality of sliding members (501), and the sliding members (501) are slidably connected to the fixing frame (3).

5. The cooling system according to claim 1, wherein: The cooling device (4) is located outside one side of the fixing frame (3) and is connected to the fixing frame (3).

6. The cooling system according to claim 1, wherein: An air inlet end (401) and an air outlet end (402) are provided on a side of the cooling device (4) close to the winding (1); the air inlet end (401) is higher than the wind shield (5), and the air outlet end (402) is lower than the wind shield (5).

7. The cooling system according to claim 1, characterized in that A plurality of clamping seats (9) are connected inside the fixing frame (3), and the clamping seats (9) are capable of clamping and fixing the iron core (2).

8. The cooling system according to claim 7, characterized in that A plurality of fans (10) are provided on the outside of the clamping seat (9) located on the lower side of the winding (1), and the air outlets of the fans (10) face the winding (1).

9. The cooling system according to claim 1, wherein: The windshield (7) is sleeved on the outside of the winding (1), and the windshield (7) comprises a fixed part (701) and a movable part (702). A connecting part (703) is provided between the fixed part (701) and the fixed frame (3); the fixed part (701) and the movable part (702) are slidably connected.

10. The cooling system according to claim 9, characterized in that The fixed part (701) is provided with a moving component (8) capable of driving the moving part (702) to move.

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